modbus: client: change 'EXNO' to '-EIO'

aatoof1 · nashif · commit 82fa487cca8f · 2025-12-08T09:36:42.000-05:00
Fix error in Modbus client write response validation.

Signed-off-by: Ahmad Atoof &lt;aat@trackunit.com&gt;
diff --git a/subsys/modbus/modbus_client.c b/subsys/modbus/modbus_client.c
@@ -227,7 +227,7 @@ static int mbc_validate_wr_response(struct modbus_context *ctx,
 	case MODBUS_FC15_COILS_WR:
 	case MODBUS_FC16_HOLDING_REGS_WR:
 		if (req_addr != resp_addr || req_value != resp_value) {
-			err = ENXIO;
+			err = -EIO;
 		} else {
 			err = 0;
 		}

Original file line number	Diff line number	Diff line change
`@@ -227,7 +227,7 @@ static int mbc_validate_wr_response(struct modbus_context *ctx,`
`227`	`227`	`case MODBUS_FC15_COILS_WR:`
`228`	`228`	`case MODBUS_FC16_HOLDING_REGS_WR:`
`229`	`229`	`if (req_addr != resp_addr \|\| req_value != resp_value) {`
`230`		`- err = ENXIO;`
	`230`	`+ err = -EIO;`
`231`	`231`	`} else {`
`232`	`232`	`err = 0;`
`233`	`233`	`}`